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Title: Laser beat wave excitation of surface plasma wave and material ablation

Abstract

Two coplanar laser beams of frequencies {omega}{sub 1} and {omega}{sub 2}, impinged on a metal surface at angles of incidence {theta} and -{theta}, resonantly excite a surface plasma wave (SPW) at the difference frequency {omega}={omega}{sub 1}-{omega}{sub 2} when {omega} has a specific value {omega}={omega}{sub R}({theta}), where {omega}{sub R} depends on {omega}{sub 1},{omega}{sub 2},{theta} and plasma frequency of the metal. The lasers exert a ponderomotive force on electrons in the skin layer and drive the SPW. The latter heats the electrons efficiently, causing efficient ablation of the material. The reduction in laser pulse lengths results in reducing the efficiency of SPW excitation and ablation.

Authors:
;  [1];  [2]
  1. Laser Science and Technology Centre, Metcalfe House, Delhi-110054 (India)
  2. (India)
Publication Date:
OSTI Identifier:
21062046
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 14; Journal Issue: 10; Other Information: DOI: 10.1063/1.2793735; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABLATION; BEAMS; EFFICIENCY; ELECTRONS; EXCITATION; HEAT; INCIDENCE ANGLE; LANGMUIR FREQUENCY; LASERS; LAYERS; LENGTH; METALS; PLASMA; PLASMA WAVES; PONDEROMOTIVE FORCE; SURFACES

Citation Formats

Singh, D. B., Tripathi, V. K., and Physics Department, Indian Institute of Technology, New Delhi-110016. Laser beat wave excitation of surface plasma wave and material ablation. United States: N. p., 2007. Web. doi:10.1063/1.2793735.
Singh, D. B., Tripathi, V. K., & Physics Department, Indian Institute of Technology, New Delhi-110016. Laser beat wave excitation of surface plasma wave and material ablation. United States. doi:10.1063/1.2793735.
Singh, D. B., Tripathi, V. K., and Physics Department, Indian Institute of Technology, New Delhi-110016. Mon . "Laser beat wave excitation of surface plasma wave and material ablation". United States. doi:10.1063/1.2793735.
@article{osti_21062046,
title = {Laser beat wave excitation of surface plasma wave and material ablation},
author = {Singh, D. B. and Tripathi, V. K. and Physics Department, Indian Institute of Technology, New Delhi-110016},
abstractNote = {Two coplanar laser beams of frequencies {omega}{sub 1} and {omega}{sub 2}, impinged on a metal surface at angles of incidence {theta} and -{theta}, resonantly excite a surface plasma wave (SPW) at the difference frequency {omega}={omega}{sub 1}-{omega}{sub 2} when {omega} has a specific value {omega}={omega}{sub R}({theta}), where {omega}{sub R} depends on {omega}{sub 1},{omega}{sub 2},{theta} and plasma frequency of the metal. The lasers exert a ponderomotive force on electrons in the skin layer and drive the SPW. The latter heats the electrons efficiently, causing efficient ablation of the material. The reduction in laser pulse lengths results in reducing the efficiency of SPW excitation and ablation.},
doi = {10.1063/1.2793735},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 10,
volume = 14,
place = {United States},
year = {2007},
month = {10}
}